Here's my situation. I have a consumer product site that has its own e-commerce system. However, the client uses Yahoo! Store for their shopping cart. When the customer needs to view their shopping cart by clicking the 'shopping cart' link I just load up the Yahoo! Store shopping cart into an IFRAME.
Right now when a user clicks 'Add to Cart' I have a form with hidden fields that passes the necessary form data to Yahoo! to populate this shopping cart. The problem is that I need to be able to pass that form data to the IFRAME that I display the Yahoo Store shopping cart in, otherwise the shopping cart pops up in the main browser window taking the users away from my clients site.
Any idea on how I can do this?